Knob attachment



(ModeL) J'. BELLAMY.

' KNOB ATTACHMENT. No. 324,640.

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SPECIFICATION forming part of Letters Patent No. 324,640, dated August 18, 1885.

Application filed April 18, 1885. (ModeL) T0 at whom it may concern:

Be it known that 1, JOHN BELLAMY, ofBoston, county of Suffolk, State of Massachusetts, have invented a certain new and useful Improvement in Knob Attachments, of which the following, taken in connection with the drawings accompanying and forming a part hereof, is afull, clear, concise, and exact de scription.

The object of my invention is the production of a simple knob-shank, which, when secured in position in the lock, will not rattle, and is not affected by the swelling or shrinking of the door; and it consists, chiefly, in certain peculiarities of construction, hereinafter more fully described, whereby the knob-shanks are readily inserted and secured in the latclrcase and thrown into operating contact with the yoke or talons by which the bolt is drawn.

Figure 1 isa plan view of my latch with the top of the ease removed. Fig. 2 isa side ele vation thereof with one of the side plates removed. Fig. 3 is a vertical section of my latch in position in a door with the knobs attached. Figs. 4: and 5 are perspective views of the knobs and shanks detached. Fig. 6 is a detail.

To all skilled in the art my invention will be readily understood from the following description of adevice embodying my invention, in which letters of reference to the accompa nying drawings are used.

A represents the case of the mortise-latch, of which 13 and C are the side plates. D is the yoke-shaped slide of well-known form, provided with a lug, a, which bears on a projection on the end of the bar E, which is attached to the bolt F, and which serves to draw the same. The movement of the knobshank H H on its axis, either to the right or to the left, causes the pinsbor (2, respectively, to bear on the projecting ends of the yoke D, and force the yoke-shaped slide back, and thus draw the bolt.

In order that the shank II H may fit the holes in the case snugly, I separate it midway of its length, each half being rigidly secured to its own knob, and make that portion of the ends of each shank which lies inside the latch-case somewhat smaller in diameter than the other parts of the shank, so that the shoulders ff will abut against the side plates, B 0, when the shanks are in position, thus taking any pushing strain which the knobs may receive. In order that the shanks may be joined in the middle of the latch when it is in position in the door, and so joined that the pins 1) (I shall project, as shown, Fig. 3, and thus actuate the yoke D, I construct it as follows: The end of one shank is recessed, as shown at 9, Fig. 4, while the end of the other is pro vided with a corresponding projection, h, Fig. 5. From a point on the inside of the recess 9 a hole is made to the outside of the shank of sufficient size to receive the pin b, which is slightly enlarged or headed at its inner end to prevent it from slipping out of the hole. If the shank be turned so as to bring the pin 1) uppermost, and the projection h be withdrawn from the recess 9, the pin will drop down into the recess. When the pin is in this position, the shank may be inserted into the look. If, after insertion, the shank be turned half round, bringing the pin lowermost, the pin will drop down and project from the shank, leaving the recess 9 free. While in this position the shank H, fitted with projection h, is inserted into the latch, the projection fitting the recess 9, and fixing the pin 1) in the position relatively to the shank shown in Fig. 3. The shank fitted with the projection it has a hole, 70, through it near the end, which is provided with the pin d having ahead on its inner end so fitted to the hole 7; as to prevent the pin from slipping out when the shank is in position shown in Fig. 3. The other end of the hole through which the pin (2 is inserted is plugged, as shown at Z. Then this shank II is inserted into the latch the projection h is uppermost, and the pin (1 lies, therefore,wholly within the hole k. In this position the shank is inserted. The projection 11, entering the recess g, locks the pin b in its projecting position, and if now the shanks be half turned the pin (1 will drop down in position to engage with the projection on the lower arm of the yoke D, while the pinb will project in contact with the projection on the upper arm of the yoke, (see Fig. 3,) thus securing the shank to the yoke and. rendering the latch operative,

As will be obvious, the recess 1 and corresponding projectionJt, may be varied in form, if desired.

For convenience in taking the knobs and their shanks out of the door, I provide a bent lever, m, of the shape shown in Fig. 6, and pivot it at the bend to one of the plates. (See Fig. 2.) Forward of the pivot the lever is split to form two arms, one of which projects on either side of the yoke in order that it may operate upon the pin d, whether the pin be located on one side or the other of the yoke. The other end of the lever m projects close to'the bar E; and a pin, p, is so set in the bar E as to come in contact with the lever m when the bar is pushed back sufficiently, which may be readily done by pressing the bolt F. The action of pinp on the leverm raises the other end of the lever and throws the pin (1 back into the hole 7c in the shank. If, now, the knob be turned, the pindis raised upward and kept in the hole It, and theshank may be readily withdrawn from the latchcase. Assoon as it is withdrawn the pin b in the other half of the shank will drop down into recess 9, thus makingit possible to withdraw the shank H also from the look.

It will be obvious that many simple forms of mechanism might be easily arranged to operate lever m; but I have shown what I consider the simplest and cheapest form.

The part 1?, Fig. 3, represents a rose or escutcheon secured to the door, which, although not essential, improves the finish and appearance of the latch.

What I claim is- 1. The combination, with the case A and yoke D for actuating the bolt, of the recessed shank H, fitted with sliding pin b, and the shank H, fitted with a projection, h, whereby as the ends of said shanks are brought together the pin 1) is locked in a projected position, for the purposes and substantially as described.

2. The case A, yoke D, and shank H, provided with recess g and pin 1), in combination with shank-H, provided with projection h, hole 7c, and pin d, said pin 01 being free to slide in hole 7r,whereby as the shank is turned, bringing the hole 70 into a vertical position, the pin d drops downward and projects below the shank in line to operate the lower arm of the yoke,substa11tially as shown and described.

3. The combination, with a knob-shank fitted with a sliding pin which acts to connect the shank with the yoke or talons, of the case A and lever m, and means for actuating it, whereby said pin may be slid back into the shank and out of line of contact with said yoke, for the purposes and substantially as described.

JOHN BELLAMY.

Witnesses:

WM. A. MAOLEOD, ROBERT WALLACE. 

